Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b01c5b9e77af9c…

MALICIOUS

PDF

71.6 KB Created: 2020-11-18 18:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3ae38382294c29a944e1cf0284bbae3e SHA-1: b9601a4b35d79a18c778ab82a452d597d5129d75 SHA-256: d8b01c5b9e77af9c7cfe423995303ae55c0ce679ec057c2f048252c4dd27830d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary malicious URL identified is trafffi.ru, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/123?utm_term=parallelism+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416502/normal_5fa26e6f5b6a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5f9dc966a4ade.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/69c6fb656594.pdfIn PDF document text
    • https://luwovizebezew.weebly.com/uploads/1/3/4/4/134482442/wopeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_5f943839922e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_5fb5292de4281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_5fa8561551d74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/apacer_usb_3._0_repair_tool_free.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/synonyms_for_poop.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/66599599150.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/62808128669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627a27e6-f13a-42c3-bb3a-0074c4331d13/44238385761.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/suganiwezuno.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/12398032241.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 5436 bytes
SHA-256: 92645c4372f93d9620e17cf04e5f8d1f48a03da2fb388a78a6f1fd5306801208
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10832 bytes
SHA-256: 829910e4090ce7ae0aadbcefa978b6ff15a7d19fa73d8073b7a1448bdeb5e2cd

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